A new elasmobranch Karksiodus mirus gen. et sp nov from the Burtnieki Regional Stage, Middle Devonian of Estonia

被引：6
|
作者：
Ivanov, Alexander [1 ]
Marss, Tiiu [2 ]
Kleesment, Anne [2 ]
机构：
[1] St Petersburg Univ, Dept Palaeontol, St Petersburg 199178, Russia
[2] Tallinn Univ Technol, Inst Geol, EE-19086 Tallinn, Estonia
来源：
ESTONIAN JOURNAL OF EARTH SCIENCES | 2011年 / 60卷 / 01期
关键词：
Karksiodus mirus gen. et sp nov; Chondrichthyes; Burtnieki Regional Stage; Givetian; Middle Devonian; Estonia; TAPHONOMY; ANTARCTICA; DENTICLES; SHARKS;
D O I：
10.3176/earth.2011.1.02
中图分类号：
P5 [地质学];
学科分类号：
0709 ; 081803 ;
摘要：
Teeth of a new elasmobranch Karksiodus mirus gen. et sp. nov. were discovered on two levels in the sandstones of the Karksi outcrop (South Estonia), corresponding to the Harma Beds, lower part of the Burtnieki Regional Stage (Givetian, Middle Devonian). These teeth differ from all known Palaeozoic elasmobranch teeth in the presence of a unique wide transversal tube-shaped basal canal, in very fine and dense striation of cusps and in an arched base without well-developed extensions. The order and family of this taxon are not specified.
引用
收藏
页码：22 / 30
页数：9
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